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V GEAR WHEEL. No. 380,454. Patented Apr. 3, 1888.

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GEAR WHEEL. No. 380,454. Patented Apr. 3, 1888.

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CHARLES H. MORGAN, OF BUFFALO, NEW YORK.

GEAR-WHEEL.

SPECIFICATION forming part of Letters Patent No. 380,454, dated April 3, 1888.

Application filed December 19, 1887. Serial No. 258,291. (No model.)

To aZZ whom it may concern.-

Be it known that 1, CHARLES H. llIORG-AN,

I of the city of Buffalo, in the county of Erie and State of New York, have invented a new and useful Improvement in Gear-Wheels, of which the following is a specification.

This invention relates to that class of gearwheels which are designed to prevent lash or lost motion, and in which the rim is yieldingly connected with'thc hub or other internal support, so as to have a limited rotary movement on the same.

The object of my invention is to construct an efficient and compact wheel of this kind which shall be simple in construction and which can be produced at comparatively small cos My invention consists of the improvements which will be hereinafter fully set forth, and pointed out in the claims.

In the accompanying drawings, Figure 1 is vertical sectional elevation of my improved gear-wheel. Fig. 2 is a crosssection thereof in line so 0:, Fig. 1. Fig. 3 is a side elevation of the hub or support upon which the rim is mounted. Fig. 4 is a vertical sectional elevation of a modified construction of my invention. Fig. 5 is a vertical sectional elevation of another modified construction. Fig. Bis a cross-section thereof. Fig. 7 isa fragmentary vertical sectional elevation of another modification. Fig. Sis a cross-section thereof.

Like letters of reference refer to like parts in the several figures.

A represents the rim upon which the gearteeth are formed, and B is the hub which is rigidly secured to the shaft 0, and which supports the rim. The latter is confined between a fixed annular flange, 1), formed at one end of the hub, and a detachable collar or ring, d, secured to the opposite contracted end of the hub by screws (1. The latter engage in screwthreaded openings formed partly in the hub and partly in the collar (1, as shown in Figs. 2 and 3.

e 6 represent cavities or recesses formed in the outer surface or peripheral face of the hub B, and f f are similar recesses formed in the inner face or bore of the rim A, adjacent to the recesses e e and registering with the latter.

9 9 represent spiral springs arranged in the recesses e e f f Each spring bears with its inner end against the inner end of one of the recesses in the hub, and with its outer end in the rim. The recesses and springs extend outwardly from the hub in opposite directions. The springs g 9 form an elastic or yielding connection between the rim and hub, whichis sufficiently stiff to compel both parts to rotate together in the normal operation of the parts, during which one of the springs is compressed to a greater or less extent in accordance with the power which is transmitted. When the pressure on the compressed spring is reduced by a change in the power or resistance, the spring expands and turns the rim on the hub as far as the play between the meshing teeth will permit, thereby preventing back and front lash or lost motion. Two springs g g are preferably arranged side by side on each side of the hub, as shown in the drawings; The springs may be formed of rubber or other elastic material.

The recesses ff in the rim are made large enough to receive the springs entirely, so that the springs will clear the hub when placed in their recesses. In applying the rim to the hub the springs are placed into the recesses f f, and the rim is then slipped over the hub. When the rim is in place, the inner ends of the springs are forced into the recesses e c of the hub by means of screws h, which project into the recesses ff and work in threaded openings formed in the rim. The inner ends of these screws bear upon plates 1;, which cover the springs and prevent the screws from interfering with the springs, while they serve at the same time to retain the springs in their proper positions and prevent them from buckling when compressed.

My improved gear-wheel is especially desirable for use in roller-mills in which the grinding or crushing rollers revolve with differential speeds, a small gear-wheel being secured to the shaft of the fast roller and a larger gearwheel to the shaft of the slow roller, and in which my improved gear-wheel prevents noise and front lash.

In the modified construction represented in Fig. 4 a single spring, 3', is seated partly in a recess, is, formed in the peripheral i'ace of the hub, and partly in a recess, Z, formed in the bore of the rim and registering with the re against the outer end of the respective recess eess is. These recesses are arranged tangentially with reference to the face of the hub, and each end of the spring bears against the adjacent ends of both recesses, so that both ends of the spring project beyond the face of the hub into the recess of the rim, thereby causing the spring to be compressed when the rim turns on the hub in either direction.

In the modified construction shown in Figs. 5 and 6 the hub is divided centrally, and the two parts mm of the hub are secured together by bolts. A semicircular recess, n, is formed in the portion of the rim surrounding the hub, and a similar recess is formed in the adjacent portions of the two parts m m of the hub. In this construction it is unnecessary to enlarge the recesses in the rim, as in the first-described construction, and the retaining-screws are dispensed with.

In the modified construction shown in Figs. 7 and 8 the springs are arranged near the periphery of the wheel, instead of near the hub. 0 is the web of the wheel, which is provided with an annular flange, 0, bearing against one side of the rim p, and with an annular rib, 0", which supports the rim. 1) is a ring or annular plate secured to the web 0 and provided with an annular flange, 19 which bears against the opposite side of the rim. A semicircular recess, q, is formed in the under side of the rim, and a similar recess, q, is formed partly in the annular rib o and partly in the ring 12. This construction also dispenses with the use of the retaining-screws and the enlarged recesses of the first-described construction. The recesses in the two last-mentioned constructions are arranged tangentially, as in the modification shown in Fig. 4, and each end of the spring bears against the adjacent ends of both reccsses.-

nal support provided with recesses extending U outwardly in opposite directions, and the rim provided in its bore with recesses registering with the recesses of the hub, of connectingsprings arranged with their inner ends in the recesses of the hub and with their outer ends in the recesses of the rim, substantially as set forth.

3. The combination, with the hub provided in its face with a recess, of a rim loosely mounted on the hub and provided in its bore with a corresponding recess, a connectingspring seated partly in the recess of the hub and partly in the recess of the rim, and ascrew whereby the spring is held against the hub,

substantially as set forth.

4. The combination, with the hub provided in its face with a recess, of a rim loosely mounted on the hub and provided in its bore with a corresponding recess, a connectingspring seated partly in the recess of the hub and partly in the recess of the rim, a screw whereby the spring, is held against the hub, and a protecting-plate interposed between the spring and the screw, substantially as set forth.

Witness my hand this 8th day of December, 1887. I

CHARLES H. MORGAN. Witnesses:

CARL F. GEYER, FRED. O. GEYER. 

